Develop Reference

How to remove a child object from a JSON object using javascript

I'm trying to search through a JSON object to find the pet-rock that I want to delete. Here is a simple JSON that I'm working on:
myData.json:
{
"data": [
{
"name": "John",
"age": "25",
"pet-rocks": [
{
"name": "Travis",
"age": "9"
},
{
"name": "Steven",
"age": "5"
},
{
"name": "Oliver",
"age": "7"
}
]
},
{
"name": "Jane",
"age": "25",
"pet-rocks": [
{
"name": "Jesse",
"age": "4"
},
{
"name": "Carol",
"age": "8"
},
{
"name": "Jake",
"age": "7"
}
]
}
]
}
I would like to do a search for "Steven" and remove that pet-rock from the list. Here are the things I've tried:
MyJSFile.js:
const myDataObject = require('./myData.json');
for (let key in myDataObject) {
let value = myDataObject[key];
if (value === "Steven")
{
delete myDataObject[key];
}
//To see if I get the data I want
console.log(key, value);
}
However, my output is strange and I'm not sure how to get to that child node of petrock. It appears that the petrocks are in object form, and I'm not sure how to get to them. here is the ouput of my console below. I assume it didn't get delete as there are still 3 petrock objects in the data.
data [
{
name: 'Robert',
age: '25',
'pet-rocks': [ [Object], [Object], [Object] ]
},
{
name: 'Robert',
age: '25',
'pet-rocks': [ [Object], [Object], [Object] ]
}
]
Any help or suggestions would be greatly appreciated! Thanks!

The pet rock named Steven is not a direct child of myDataObject, so you can't delete it like that. You can loop through the "data" array, rebuilding the "pet-rocks" array for each element. A simple filter to remove any pet rocks named Steven should work.
const myDataObject = {
"data": [
{
"name": "John",
"age": "25",
"pet-rocks": [
{
"name": "Travis",
"age": "9"
},
{
"name": "Steven",
"age": "5"
},
{
"name": "Oliver",
"age": "7"
}
]
},
{
"name": "Jane",
"age": "25",
"pet-rocks": [
{
"name": "Jesse",
"age": "4"
},
{
"name": "Carol",
"age": "8"
},
{
"name": "Jake",
"age": "7"
}
]
}
]
};
myDataObject.data.forEach(d => {
d["pet-rocks"] = d["pet-rocks"].filter(rock => rock.name !== "Steven");
});
console.log(myDataObject);

Object with nested array to filter, want to return entire object with new filtered array

I'm attempting to remove an object out of an array nested within my movie object and then copy it to a new variable. So my original object looks like this:
{
"id": 1,
"title": "Avatar",
"movieLength": 162,
"releaseDate": "2009-12-18",
"trailerUrl": "https://www.youtube.com/watch?v=5PSNL1qE6VY",
"genre": {
"id": 1,
"genre": "Action"
},
"rating": {
"id": 3,
"rating": "PG-13"
},
"director": {
"id": 1,
"lastName": "Cameron",
"firstName": "James"
},
"actors": [
{
"id": 2,
"lastName": "Worthington",
"firstName": "Sam"
},
{
"id": 3,
"lastName": "Weaver",
"firstName": "Sigourney"
},
{
"id": 4,
"lastName": "Saldana",
"firstName": "Zoe"
}
],
"comments": []
}
and what I'm doing right now is
const updatedMovie = const updatedMovie = movie.actors.filter((actor) => actor.id !== id);
but as you know that only returns the array of actors I filtered. I want to copy the entire object with the newly filtered actors so the object will come out like this (removing actor id 3):
{
"id": 1,
"title": "Avatar",
"movieLength": 162,
"releaseDate": "2009-12-18",
"trailerUrl": "https://www.youtube.com/watch?v=5PSNL1qE6VY",
"genre": {
"id": 1,
"genre": "Action"
},
"rating": {
"id": 3,
"rating": "PG-13"
},
"director": {
"id": 1,
"lastName": "Cameron",
"firstName": "James"
},
"actors": [
{
"id": 2,
"lastName": "Worthington",
"firstName": "Sam"
},
{
"id": 4,
"lastName": "Saldana",
"firstName": "Zoe"
}
],
"comments": []
}
I've tried reading around but I'm not having any luck getting any solutions to work with me, so if anyone can help or point me in the right direction that would be great!

If you want to mutate the existing object, just assign the result of the .filter to the .actors property.
movie.actors = movie.actors.filter((actor) => actor.id !== id);
console.log(movie);
If you want to keep the existing object unmutated, spread the rest of the properties into a new object while filtering.
const updatedMovie = {
...movie,
actors: movie.actors.filter((actor) => actor.id !== id)
};
console.log(updatedMovie);

const movies = {
"id": 1,
"title": "Avatar",
"movieLength": 162,
"releaseDate": "2009-12-18",
"trailerUrl": "https://www.youtube.com/watch?v=5PSNL1qE6VY",
"genre": {
"id": 1,
"genre": "Action"
},
"rating": {
"id": 3,
"rating": "PG-13"
},
"director": {
"id": 1,
"lastName": "Cameron",
"firstName": "James"
},
"actors": [
{
"id": 2,
"lastName": "Worthington",
"firstName": "Sam"
},
{
"id": 3,
"lastName": "Weaver",
"firstName": "Sigourney"
},
{
"id": 4,
"lastName": "Saldana",
"firstName": "Zoe"
}
],
"comments": []
}
const id = 3; // or any other id you want
const actors = movies.actors.filter(actor => actor.id != id)
const newMovies = Object.assign({}, movies , { actors })
console.log(newMovies)

Knexnest query not returning data in array even though this is what is expected

I have this knexnest query:
const query = knex.select([
'notes.id AS _id',
'notes.note AS _note',
'notes.timestamp AS _timestamp',
'customers.id AS _customerId',
'users.name AS _name',
'products.id AS _productId',
'tags.id AS _tags_tagId',
'tags.title AS _tags_tagTitle',
'tags.type AS _tags_tagType',
]).from('notes')
.join('users', 'notes.user_id', 'users.id')
.join('customers', 'notes.customer_id', 'customers.id')
.leftJoin('products', 'notes.product_id', 'products.id')
.leftJoin('note_tags', 'notes.id', 'note_tags.note_id')
.leftJoin('tags', 'note_tags.tag_id', 'tags.id')
.where('customers.id', customerId);
return knexnest(query);
My response json looks like this:
{
"id": 47,
"note": "This is an updated1 note",
"timestamp": "2019-07-12T15:17:27.281Z",
"customerId": 111781,
"name": "Paul",
"productId": 1,
"tags": {
"tagId": 4,
"tagTitle": "price",
"tagType": "product"
}
}
The problem is that the database returns more than one tag, only one is displayed. I'm expecting a response like this:
{
"id": 47,
"note": "This is an updated1 note",
"timestamp": "2019-07-12T15:17:27.281Z",
"customerId": 111781,
"name": "Paul",
"productId": 1,
"tags": {[
{
"tagId": 4,
"tagTitle": "price",
"tagType": "product"
},
{
"tagId": 5,
"tagTitle": "quality",
"tagType": "product"
}
]}
}
Have I got something wrong in my query that is causing this?

Got it. I was missing double __ in the tags:
'tags.id AS _tags__tagId',
'tags.title AS _tags__tagTitle',
'tags.type AS _tags__tagType'

Return new form of arrays - javascript

My data:
{
"rows": [
{
"id": 3,
"code": "airtel121",
"position": "manager",
"salary": "25000",
"login": {
"id": 4,
"username": "sameer",
"firstName": "Mohamed",
"lastName": "Sameer",
"code": "airtel121",
}
},
{
"id": 7,
"code": "airtel121",
"position": null,
"salary": null,
"login": {
"id": 8,
"username": "annamalai",
"firstName": "Anna",
"lastName": "malai",
"code": "airtel121",
}
}
]
}
My expected outcome:
{
"rows": [
{
"id": 4,
"username": "sameer",
"firstName": "Mohamed",
"lastName": "Sameer",
"code": "airtel121",
"staffs": [
{
"id": 3,
"code": "airtel121",
"position": "manager",
"salary": "25000",
}
]
},
{
"id": 8,
"username": "annamalai",
"firstName": "Anna",
"lastName": "malai",
"code": "airtel121",
"staffs": [
{
"id": 7,
"code": "airtel121",
"position": null",
"salary": null",
}
]
}
]
}
I tried, but only i am getting first object, check my fiddle:
http://jsbin.com/qaqehakuwi/edit?js,output
Is this possible to loop using for loop or it can be done by lodash?
Check my above jsbin link for code.
I am using ES6 way of code in my project, so i used spread operator.

You can use map to create the rows array of the new object from the rows array of the old one:
let newObj = {
rows: oldObj.rows.map(row => { // map the rows of the old object into the rows of the new object
let { login, ...rest } = row; // for each object/row get the login object as 'login' and the rest of the props as 'rest'
return { ...login, staffs: [rest] }; // return a new object that has the props of 'login' and an additional prop 'staffs' which is an array containing 'rest'
})
};
Example:
let oldObj = {"rows":[{"id":3,"code":"airtel121","position":"manager","salary":"25000","login":{"id":4,"username":"sameer","firstName":"Mohamed","lastName":"Sameer","code":"airtel121"}},{"id":7,"code":"airtel121","position":null,"salary":null,"login":{"id":8,"username":"annamalai","firstName":"Anna","lastName":"malai","code":"airtel121"}}]};
let newObj = {
rows: oldObj.rows.map(row => {
let { login, ...rest } = row;
return { ...login, staffs: [rest] };
})
};
console.log(newObj);

Using ember-data with custom serializer

I have you could say a non standard json api. I'm trying to use ember-data with it so from my reading around I need to create a serializer. I tried to find article online explaining how to do this but haven't found anything useful. I tried looking through the ember guides but also found nothing. Here is an example of my api:
collection of data:
{
"data": [
{
"id": 14,
"name": "company name",
"slug": "company-name",
"detail": {
"data": {
"id": 10,
"address": "10000 sw 16th ct",
"city": "Hollywood",
"state": "Alabama"
}
},
"employees": {
"data": [
{
"id": 17,
"first_name": "Peter",
"last_name": "Griffin",
"email": "company-name#Griffin.co"
},
{
"id": 18,
"first_name": "Robert",
"last_name": "Gornitz",
"email": null
}
]
}
},
{
"id": 8,
"name": "company name",
"slug": "company-name",
"detail": {
"data": {
"id": 8,
"address": "1000 n university dr",
"city": "Fort Lauderdale",
"state": "West Virginia"
}
},
"employees": {
"data": [
{
"id": 15,
"first_name": "Peter",
"last_name": "Griffin"
},
{
"id": 16,
"first_name": "Peter",
"last_name": "Griffin"
}
]
}
}
]
}
Here is an item with its relationships:
{
"data": {
"id": 1,
"name": "company name",
"slug": "company-name",
"detail": {
"data": {
"id": 1,
"address": "1515 n university dr",
"city": "Miami",
"state": "Mississippi"
}
},
"employees": {
"data": [
{
"id": 1,
"first_name": "Peter",
"last_name": "Griffin",
"email": "peter#email.com"
},
{
"id": 2,
"first_name": "Peter",
"last_name": "Griffin",
"email": "peter#email.com"
}
]
}
}
}
Are there any good resources showing me how to do this? Or should I just not use ember-data?

Just some tips from my side using Ember Data. I believe that you either have to be able the adapt api or write a deserializer:
1. Root Key "data"
Ember expects the root key to be the name of the model (e.g. "company"). You can handle that easily by creating an application serializer and overwriting the extractArray and extractSingle method by grabbing the payload from the 'data' key instead of the model "typeKey".
2. Embedded Records
You can use the EmbeddedRecordsMixin. But for that you will have to skip the root key "data" in the embedded records and directly include them (e.g. "employees": [ { id: "2", ... }, ... ])
I'd have a look at the EmbeddedRecordsMixin for that:
http://emberjs.com/api/data/classes/DS.EmbeddedRecordsMixin.html
http://emberjs.com/api/data/classes/DS.EmbeddedRecordsMixin.html#method_normalize
Hope that helps a little.